Installation issues with H76 type disc check valve 2
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For a check valve of the H76 type, as shown in the figure below, it is installed at the outlet of the water pump. Currently, the manufacturer requires that it be installed at a distance of 5–10 pipe diameters from the pump outlet, in order to prevent oscillation of the valve disc. Is this requirement reasonable? Is the oscillation of the valve disc caused by it being too close to the pump outlet?
For users, it is generally advisable to follow the manufacturer’s recommendations.
For the axial flow check valves we produce, it is generally required that the pipes installed on-site have a diameter that is 4 times larger than that of the valve inlet and 8 times larger than that of the valve outlet. This is done to prevent bends in the pipes from causing the fluid to flow through the check valve in a turbulent manner, which could lead to vibration of the valve as well as a reduction in its flow-blocking efficiency.
Do swing check valves have the same problem as well?
Is it also related to the type of pump? Can centrifugal pumps experience such problems? After stabilizing the flow
Follow the manufacturer’s instructions strictly, or you’ll regret it! Maintain a length of at least 4 times the pipe diameter; don’t ask me why. I installed it close to the pump back then, and problems arose as a result
There are not many manufacturers that can do this
Are there any standard documents for this 4 times the diameter length? Some people are unreasonable and only look at the documents